This is actually true, but it really boils down to the engagement letter that was provided to the appraiser and what was agreed upon. A review appraisal could be just a review of process without an opinion of value, but if that was what was asked for and agreed upon, that should have been delivered. It sounded to me from the original post, they didn't get what they asked for.
For a complete copy of what Opinion 20 says -
Opinion 20